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Sooty 4th Plug

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    #1

    Sooty 4th Plug

    The 4th plug seems quite sooty and comes off easily with wiping it genthly (no wire brush required). I am runnng the following...

    - ) 4into1 - V&H
    - ) K&N filter (stock type)

    have checked the following
    - Float height - all ok
    - Air screw - set to bursen blue using colortune - The colour is all ok at idle (blue), flick (yellow) and steady RPM (Blue).
    - Balanceed all carbs using vacumn (however a little difficult to get the 4th cylinder to sync). If sync'd at idle - high RPM goes for a toss and vice versa for Cyl 4
    - Plugs : NGK iridium plugs...
    - CArbs all cleaned - no leaks
    - All the other plugs are nice and grey

    I have not yet checked the valve clearance ....could this be the reason for it to soot ?


    Model : 1981, GSX750 (Alias GS750E)

    thanks
    Tags: None
    #2
    Any oil smoke from exhaust?
    Good spark on #4?
    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
    1985 GS1150ES stock with 85 Red E bodywork.

    Comment

      #3
      good spark

      Spark is very good...The Plug is dry...no smoke from the exhaust but do smell fuel when the bike is running.

      Comment

        #4
        Have you checked to make sure that the choke slide is not hanging up on that carb? It could be valves. If things are getting too tight, you'll have less air on the intake stroke less exhaust getting out and thus be running rich.
        Last edited by Dave8338; 01-28-2008, 10:50 AM.

        Comment

          #5
          Choke ok

          The choke side is ok...The Idling is perfect ...response on throttle is also great...

          Comment

            #6
            I'de check the valves...if nothing else, it's easy and you can then rule them out.

            Comment

              #7
              valves ok

              Checked the valves - some were slightly off except the 4th cylinder.

              Anyways got them all set ...rode the bike ...BUT the 4th one is still covered with Black Soot.

              I interchanged the plug wires and coil - maybe be a bad coil. but still the plug is black.

              When i tried to balance the carbs...noticed that I am unable to get the 4th cylinder to sync at idle - at high RPM 2500K , I am able to sync it but then the idle is going for a total toss. I usually leave the balance at 3000 K as that where i am when I ride

              Would a Rich Carb cause this ? The colortune is showing all ok at idle (blue), Blip (Yellow) and steady High RPM (Blue)

              Comment

                #8
                I would think weak spark, but you already covered that. Maybe someone previous had been adjusting the carbs & tried to adj the #3 screwing up the baseline

                Comment

                  #9
                  baseline ?

                  What do you mean by up the baseline ?

                  cylinders 1,2,3 can be sync in line...the 4th shows a higher level on the vacumn gauge.

                  Comment

                    #10
                    You have to bring the other two down to four. #3 is not adjustable.
                    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                    1985 GS1150ES stock with 85 Red E bodywork.

                    Comment

                      #11
                      all in line

                      Have managed to sync (in line) with 3 - so now 1,2,3 are all in sync at all RPM's...the 4th goes for a toss.

                      At Idle : Cant adjust the 4th to be in line with the other 3 cylinders (or even the 3rd). The vacumn need for the 4th is aways about couple of PSI above the 3rd one. Adjusting it makes it worse.

                      At 2.5K : Increase the idle to 2.5 using the throttle cable screw - sync them all in line and then bring the idle down, but the bike runs like crap after it... plus I notice if i do that...the 4th one opens a little late from idle.

                      Comment

                        #12
                        The first sync can be a pita. Bring four down to three and mess around with them. You'll see that one will affect the others.
                        Keep plugging at it. You'll get it.
                        Make sure a couple of fans are blowing on the headers.
                        1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                        1985 GS1150ES stock with 85 Red E bodywork.

                        Comment

                          #13
                          4 remains there

                          I just cant get the 4th one down to level with 3rd.

                          If i back out the adjust screw completely it still remains a couple of PSI higher. The 4th cylinder needle is higher than the 3rd (and the rest) - I think indicate there is less vacumn.

                          IF i screw it in the difference between will increase and the 3rd level with also decrease hence effectivitly increasign the gap...hope not too confusing.

                          Comment

                            #14
                            You need to lower the other two to lower the idle and bring four down.
                            1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                            1985 GS1150ES stock with 85 Red E bodywork.

                            Comment

                              #15
                              not happening buddy - not happening.

                              I have tried all tricks ...

                              BTW - should the adjustment be done at idle or at cruise rpm (2.5 / 3 )?

                              from what i understand...

                              3 is fixed
                              1/2 - the link between these 2 will level my 1 and 2 carbs
                              3/4 - will level 3 and 4 (so this is step 2)
                              2/3 - will level 2 and 3 hence need to level 1 /2 first. and at this point since 3/4 are in sync and 1/2 are in sync...will sync all 4

                              correct ????


                              maybe i should back them all out and start all over again to sync..any specific order or the above is correct.

                              Thanks for your inputs////

                              Comment

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